如何向HTML5 Canvas添加撤消功能？ [英] How to add undo-functionality to HTML5 Canvas?

问题描述

我有一个草图应用程序在所有的HTML5和Javascript中完成，我想知道如何创建一个撤消按钮，所以你可以撤消你最后一件事。任何想法？

I have a Sketching app done in all HTML5 and Javascript, and I was wondering how I would create an Undo Button, so you could undo the last thing you drew. Any idea?

推荐答案

您必须将所有修改存储在数据结构中。然后，如果用户想要撤消，您可以删除最新的修改。然后再次从数据结构重绘所有绘图操作。

You have to store all modifications in a datastructure. Then you can delete the latest modification if the user wants to undo it. Then you repaint all drawing operations from your datastructure again.

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